Non-volatile memory device

An electronic memory device comprising at least one basic unit, which is configured as a memory cell for storing at least one bit of information, the basic unit comprising a vacuum cavity for free charge carriers propagation therethrough, and comprising a source of charge carriers defining a region of charge carriers emission or entry into the vacuum cavity and an anode electrode which are kept under controllable voltage conditions, and at least one floating gate electrode accommodated in a path of said free charge carriers propagating through the vacuum cavity between said emission or entry region and said anode, the source of charge carriers comprising a photocathode under controlled illumination to cause emission of electrons therefrom, said at least one floating gate electrode serving for storing therein a charge indicative of the at least one bit of information.